期刊
CHEMISTRY-AN ASIAN JOURNAL
卷 14, 期 10, 页码 1814-1822出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/asia.201801669
关键词
bulk heterojunctions; ladder-type arenes; non-fullerene acceptors; polycyclic aromatics; polymer solar cells
资金
- National Natural Science Foundation of China [21673170]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing [2017-KF-9, 2018-KF-3, 2018-KF-10]
- AcRF Tier 1, Singapore [RG 111/17, RG 2/17, RG 114/16, RG 8/16]
- AcRF Tier 2, Singapore [MOE 2017-T2-1-021]
The ladder-type nonacyclic arene (bis(thieno[3,2-b]thieno)cyclopentafluorene (BTTF)) has been designed and synthesized through fusing thienothiophenes with the fluorene core from the synthon of dimethyl 9,9-dioctyl-2,7-bis(thieno[3,2-b]thiophen-2-yl)fluorene-3,6-dicarboxylate. With BTTF as the central donor unit, a novel acceptor-donor-acceptor (A-D-A) type non-fullerene small-molecule acceptor (BTTFIC) was prepared with 1,1-dicyanomethylene-3-indanones (IC) as the peripheral acceptor units. The energy level of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of BTTFIC locate at -5.56 and -3.95eV, respectively, presenting a low optical band gap of 1.58eV. Encouragingly, polymer solar cells based on the blends of BTTFIC with both the representative wide- and low-bandgap polymer donors (PBDB-T, 1.82eV. PTB7-Th, 1.58eV) offer power conversion efficiencies over 8% (8.78 +/- 0.18% for PBDB-T:BTTFIC and 8.18 +/- 0.29% for PTB7-Th:BTTFIC). These results highlight the advantage of ladder-type BTTF on the preparation of nonfullerene acceptors with extended conjugated backbones.
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